Quote:
(a) When one of your objects moves, the sound moves with it.
Assuming you are using "camera", then ent_playsound or ent_playloop should work. See manual...
Code:
ent_playsound (entity, sound, var volume);
ent_playloop (entity, sound, var volume);
Quote:
(b) To play stereo sounds when the user enters a certain zone in the
landscape.
See manual regarding media_play and media_loop... You would have to play the sounds, depending on the position of the player... Code:
media_play(string, bmap, var volume)
media_loop(string, bmap, var volume)
Quote:
(c) To add sound effects such as reverb, delays, pitch shifts and EQ
in realtime. The effects are added in appropriate interactive
situations - e.g. when the user goes inside one of the objects.
See manual regarding media_tune Code:
media_tune(var handle,var volume,var rate,var balance)
Quote:
(e) to cross fade from a mono to a stereo sound *or change the width
of a stereo image* as you approach an object (IMPORTANT)
Hmmnnn change the stereo pitch? How about snd_play or snd_loop??? see manual... Code:
snd_PLAY (sound, var volume, var balance);
This only works with .wav files Quote:
(e) if the computer / sound card has 5.1 or multi.channel output to be
able to spatialise the sound in front and behind the listener as
appropriate. That applies to mono and stereo sounds, and sound-width
image changes and will be very good when we use projectors and
loudspeakers.
Fade from front to back speakers??? I don't think this is possible... 
